<!DOCTYPE HTML>
<html lang="zh-CN">


<head>
    <meta charset="utf-8">
    <meta name="keywords" content="JS语法总结, blog">
    <meta name="description" content="这是我的个人网站，欢迎来访">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=no">
    <meta name="renderer" content="webkit|ie-stand|ie-comp">
    <meta name="mobile-web-app-capable" content="yes">
    <meta name="format-detection" content="telephone=no">
    <meta name="apple-mobile-web-app-capable" content="yes">
    <meta name="apple-mobile-web-app-status-bar-style" content="black-translucent">
    <!-- Global site tag (gtag.js) - Google Analytics -->


    <title>JS语法总结 | 头号咸鱼</title>
    <link rel="icon" type="image/png" href="/favicon.png">

    <link rel="stylesheet" type="text/css" href="/libs/awesome/css/all.css">
    <link rel="stylesheet" type="text/css" href="/libs/materialize/materialize.min.css">
    <link rel="stylesheet" type="text/css" href="/libs/aos/aos.css">
    <link rel="stylesheet" type="text/css" href="/libs/animate/animate.min.css">
    <link rel="stylesheet" type="text/css" href="/libs/lightGallery/css/lightgallery.min.css">
    <link rel="stylesheet" type="text/css" href="/css/matery.css">
    <link rel="stylesheet" type="text/css" href="/css/my.css">

    <script src="/libs/jquery/jquery.min.js"></script>

    <script>(function(i,s,o,g,r,a,m){i["DaoVoiceObject"]=r;i[r]=i[r]||function(){(i[r].q=i[r].q||[]).push(arguments)},i[r].l=1*new Date();a=s.createElement(o),m=s.getElementsByTagName(o)[0];a.async=1;a.src=g;a.charset="utf-8";m.parentNode.insertBefore(a,m)})(window,document,"script",('https:' == document.location.protocol ? 'https:' : 'http:') + "//widget.daovoice.io/widget/7b318e23.js","daovoice")</script>
    

<meta name="generator" content="Hexo 5.3.0">
<style>.github-emoji { position: relative; display: inline-block; width: 1.2em; min-height: 1.2em; overflow: hidden; vertical-align: top; color: transparent; }  .github-emoji > span { position: relative; z-index: 10; }  .github-emoji img, .github-emoji .fancybox { margin: 0 !important; padding: 0 !important; border: none !important; outline: none !important; text-decoration: none !important; user-select: none !important; cursor: auto !important; }  .github-emoji img { height: 1.2em !important; width: 1.2em !important; position: absolute !important; left: 50% !important; top: 50% !important; transform: translate(-50%, -50%) !important; user-select: none !important; cursor: auto !important; } .github-emoji-fallback { color: inherit; } .github-emoji-fallback img { opacity: 0 !important; }</style>
<link rel="alternate" href="/atom.xml" title="头号咸鱼" type="application/atom+xml">
</head>




<body>
    <header class="navbar-fixed">
    <nav id="headNav" class="bg-color nav-transparent">
        <div id="navContainer" class="nav-wrapper container">
            <div class="brand-logo">
                <a href="/" class="waves-effect waves-light">
                    
                    <img src="/medias/logo.png" class="logo-img" alt="LOGO">
                    
                    <span class="logo-span">头号咸鱼</span>
                </a>
            </div>
            

<a href="#" data-target="mobile-nav" class="sidenav-trigger button-collapse"><i class="fas fa-bars"></i></a>
<ul class="right nav-menu">
  
  <li class="hide-on-med-and-down nav-item">
    
    <a href="/" class="waves-effect waves-light">
      
      <i class="fas fa-home" style="zoom: 0.6;"></i>
      
      <span>首页</span>
    </a>
    
  </li>
  
  <li class="hide-on-med-and-down nav-item">
    
    <a href="/tags" class="waves-effect waves-light">
      
      <i class="fas fa-tags" style="zoom: 0.6;"></i>
      
      <span>标签</span>
    </a>
    
  </li>
  
  <li class="hide-on-med-and-down nav-item">
    
    <a href="/categories" class="waves-effect waves-light">
      
      <i class="fas fa-bookmark" style="zoom: 0.6;"></i>
      
      <span>分类</span>
    </a>
    
  </li>
  
  <li class="hide-on-med-and-down nav-item">
    
    <a href="/archives" class="waves-effect waves-light">
      
      <i class="fas fa-archive" style="zoom: 0.6;"></i>
      
      <span>归档</span>
    </a>
    
  </li>
  
  <li class="hide-on-med-and-down nav-item">
    
    <a href="/about" class="waves-effect waves-light">
      
      <i class="fas fa-user-circle" style="zoom: 0.6;"></i>
      
      <span>关于</span>
    </a>
    
  </li>
  
  <li class="hide-on-med-and-down nav-item">
    
    <a href="/contact" class="waves-effect waves-light">
      
      <i class="fas fa-comments" style="zoom: 0.6;"></i>
      
      <span>留言板</span>
    </a>
    
  </li>
  
  <li class="hide-on-med-and-down nav-item">
    
    <a href="/friends" class="waves-effect waves-light">
      
      <i class="fas fa-address-book" style="zoom: 0.6;"></i>
      
      <span>友情链接</span>
    </a>
    
  </li>
  
  <li>
    <a href="#searchModal" class="modal-trigger waves-effect waves-light">
      <i id="searchIcon" class="fas fa-search" title="搜索" style="zoom: 0.85;"></i>
    </a>
  </li>
</ul>


<div id="mobile-nav" class="side-nav sidenav">

    <div class="mobile-head bg-color">
        
        <img src="/medias/logo.png" class="logo-img circle responsive-img">
        
        <div class="logo-name">头号咸鱼</div>
        <div class="logo-desc">
            
            这是我的个人网站，欢迎来访
            
        </div>
    </div>

    

    <ul class="menu-list mobile-menu-list">
        
        <li class="m-nav-item">
	  
		<a href="/" class="waves-effect waves-light">
			
			    <i class="fa-fw fas fa-home"></i>
			
			首页
		</a>
          
        </li>
        
        <li class="m-nav-item">
	  
		<a href="/tags" class="waves-effect waves-light">
			
			    <i class="fa-fw fas fa-tags"></i>
			
			标签
		</a>
          
        </li>
        
        <li class="m-nav-item">
	  
		<a href="/categories" class="waves-effect waves-light">
			
			    <i class="fa-fw fas fa-bookmark"></i>
			
			分类
		</a>
          
        </li>
        
        <li class="m-nav-item">
	  
		<a href="/archives" class="waves-effect waves-light">
			
			    <i class="fa-fw fas fa-archive"></i>
			
			归档
		</a>
          
        </li>
        
        <li class="m-nav-item">
	  
		<a href="/about" class="waves-effect waves-light">
			
			    <i class="fa-fw fas fa-user-circle"></i>
			
			关于
		</a>
          
        </li>
        
        <li class="m-nav-item">
	  
		<a href="/contact" class="waves-effect waves-light">
			
			    <i class="fa-fw fas fa-comments"></i>
			
			留言板
		</a>
          
        </li>
        
        <li class="m-nav-item">
	  
		<a href="/friends" class="waves-effect waves-light">
			
			    <i class="fa-fw fas fa-address-book"></i>
			
			友情链接
		</a>
          
        </li>
        
        
        <li><div class="divider"></div></li>
        <li>
            <a href="https://github.com/blinkfox/hexo-theme-matery" class="waves-effect waves-light" target="_blank">
                <i class="fab fa-github-square fa-fw"></i>Fork Me
            </a>
        </li>
        
    </ul>
</div>


        </div>

        
            <style>
    .nav-transparent .github-corner {
        display: none !important;
    }

    .github-corner {
        position: absolute;
        z-index: 10;
        top: 0;
        right: 0;
        border: 0;
        transform: scale(1.1);
    }

    .github-corner svg {
        color: #0f9d58;
        fill: #fff;
        height: 64px;
        width: 64px;
    }

    .github-corner:hover .octo-arm {
        animation: a 0.56s ease-in-out;
    }

    .github-corner .octo-arm {
        animation: none;
    }

    @keyframes a {
        0%,
        to {
            transform: rotate(0);
        }
        20%,
        60% {
            transform: rotate(-25deg);
        }
        40%,
        80% {
            transform: rotate(10deg);
        }
    }
</style>

<a href="https://github.com/blinkfox/hexo-theme-matery" class="github-corner tooltipped hide-on-med-and-down" target="_blank"
   data-tooltip="Fork Me" data-position="left" data-delay="50">
    <svg viewBox="0 0 250 250" aria-hidden="true">
        <path d="M0,0 L115,115 L130,115 L142,142 L250,250 L250,0 Z"></path>
        <path d="M128.3,109.0 C113.8,99.7 119.0,89.6 119.0,89.6 C122.0,82.7 120.5,78.6 120.5,78.6 C119.2,72.0 123.4,76.3 123.4,76.3 C127.3,80.9 125.5,87.3 125.5,87.3 C122.9,97.6 130.6,101.9 134.4,103.2"
              fill="currentColor" style="transform-origin: 130px 106px;" class="octo-arm"></path>
        <path d="M115.0,115.0 C114.9,115.1 118.7,116.5 119.8,115.4 L133.7,101.6 C136.9,99.2 139.9,98.4 142.2,98.6 C133.8,88.0 127.5,74.4 143.8,58.0 C148.5,53.4 154.0,51.2 159.7,51.0 C160.3,49.4 163.2,43.6 171.4,40.1 C171.4,40.1 176.1,42.5 178.8,56.2 C183.1,58.6 187.2,61.8 190.9,65.4 C194.5,69.0 197.7,73.2 200.1,77.6 C213.8,80.2 216.3,84.9 216.3,84.9 C212.7,93.1 206.9,96.0 205.4,96.6 C205.1,102.4 203.0,107.8 198.3,112.5 C181.9,128.9 168.3,122.5 157.7,114.1 C157.9,116.9 156.7,120.9 152.7,124.9 L141.0,136.5 C139.8,137.7 141.6,141.9 141.8,141.8 Z"
              fill="currentColor" class="octo-body"></path>
    </svg>
</a>
        
    </nav>

</header>

    



<div class="bg-cover pd-header post-cover" style="background-image: url('https://cdn.jsdelivr.net/gh/liangxinxin5102/image2/cartoon01/wallhaven-x11rgz.jpg')">
    <div class="container" style="right: 0px;left: 0px;">
        <div class="row">
            <div class="col s12 m12 l12">
                <div class="brand">
                    <h1 class="description center-align post-title">JS语法总结</h1>
                </div>
            </div>
        </div>
    </div>
</div>




<main class="post-container content">

    
    <link rel="stylesheet" href="/libs/tocbot/tocbot.css">
<style>
    #articleContent h1::before,
    #articleContent h2::before,
    #articleContent h3::before,
    #articleContent h4::before,
    #articleContent h5::before,
    #articleContent h6::before {
        display: block;
        content: " ";
        height: 100px;
        margin-top: -100px;
        visibility: hidden;
    }

    #articleContent :focus {
        outline: none;
    }

    .toc-fixed {
        position: fixed;
        top: 64px;
    }

    .toc-widget {
        width: 345px;
        padding-left: 20px;
    }

    .toc-widget .toc-title {
        padding: 35px 0 15px 17px;
        font-size: 1.5rem;
        font-weight: bold;
        line-height: 1.5rem;
    }

    .toc-widget ol {
        padding: 0;
        list-style: none;
    }

    #toc-content {
        padding-bottom: 30px;
        overflow: auto;
    }

    #toc-content ol {
        padding-left: 10px;
    }

    #toc-content ol li {
        padding-left: 10px;
    }

    #toc-content .toc-link:hover {
        color: #42b983;
        font-weight: 700;
        text-decoration: underline;
    }

    #toc-content .toc-link::before {
        background-color: transparent;
        max-height: 25px;

        position: absolute;
        right: 23.5vw;
        display: block;
    }

    #toc-content .is-active-link {
        color: #42b983;
    }

    #floating-toc-btn {
        position: fixed;
        right: 15px;
        bottom: 76px;
        padding-top: 15px;
        margin-bottom: 0;
        z-index: 998;
    }

    #floating-toc-btn .btn-floating {
        width: 48px;
        height: 48px;
    }

    #floating-toc-btn .btn-floating i {
        line-height: 48px;
        font-size: 1.4rem;
    }
</style>
<div class="row">
    <div id="main-content" class="col s12 m12 l9">
        <!-- 文章内容详情 -->
<div id="artDetail">
    <div class="card">
        <div class="card-content article-info">
            <div class="row tag-cate">
                <div class="col s7">
                    
                    <div class="article-tag">
                        
                            <a href="/tags/%E8%AE%B0%E5%BD%95/">
                                <span class="chip bg-color">记录</span>
                            </a>
                        
                            <a href="/tags/JavaScrip/">
                                <span class="chip bg-color">JavaScrip</span>
                            </a>
                        
                    </div>
                    
                </div>
                <div class="col s5 right-align">
                    
                    <div class="post-cate">
                        <i class="fas fa-bookmark fa-fw icon-category"></i>
                        
                            <a href="/categories/web/" class="post-category">
                                web
                            </a>
                        
                    </div>
                    
                </div>
            </div>

            <div class="post-info">
                
                <div class="post-date info-break-policy">
                    <i class="far fa-calendar-minus fa-fw"></i>发布日期:&nbsp;&nbsp;
                    2021-03-17
                </div>
                

                
                <div class="post-date info-break-policy">
                    <i class="far fa-calendar-check fa-fw"></i>更新日期:&nbsp;&nbsp;
                    2021-03-17
                </div>
                

                
                <div class="info-break-policy">
                    <i class="far fa-file-word fa-fw"></i>文章字数:&nbsp;&nbsp;
                    4.4k
                </div>
                

                
                <div class="info-break-policy">
                    <i class="far fa-clock fa-fw"></i>阅读时长:&nbsp;&nbsp;
                    23 分
                </div>
                

                
                    <div id="busuanzi_container_page_pv" class="info-break-policy">
                        <i class="far fa-eye fa-fw"></i>阅读次数:&nbsp;&nbsp;
                        <span id="busuanzi_value_page_pv"></span>
                    </div>
				
            </div>
        </div>
        <hr class="clearfix">

        
        <!-- 是否加载使用自带的 prismjs. -->
        <link rel="stylesheet" href="/libs/prism/prism.css">
        

        

        <div class="card-content article-card-content">
            <div id="articleContent">
                <blockquote>
<p>相关内容还是看一些教程网站吧！像w3school，菜鸟教程等。这里只是对之前的笔记做的一个总结，学习相关的知识还是要多练习，多运用。</p>
</blockquote>
<h2 id="一、JS简介"><a href="#一、JS简介" class="headerlink" title="一、JS简介"></a>一、JS简介</h2><p><img src="https://gitee.com/liangxinixn/guitar/raw/master/blog01/20201011105306.png"></p>
<h6 id="为什么使用JS"><a href="#为什么使用JS" class="headerlink" title="为什么使用JS"></a>为什么使用JS</h6><p><img src="https://gitee.com/liangxinixn/guitar/raw/master/blog01/20201011105405.png"></p>
<p><img src="https://gitee.com/liangxinixn/guitar/raw/master/blog01/20201011105413.png"></p>
<ul>
<li>易于使用</li>
<li>可改善性能</li>
<li>与浏览器集成</li>
</ul>
<h6 id="lt-script-gt-标签"><a href="#lt-script-gt-标签" class="headerlink" title="<script>标签"></a>&lt;script&gt;标签</h6><p><img src="https://gitee.com/liangxinixn/guitar/raw/master/blog01/20201011121036.png"></p>
<ul>
<li>HTML5中&lt;script&gt;标签的type的属性值默认为text/javascript</li>
<li>src属性引入外部js代码，使js代码可以共享</li>
</ul>
<h6 id="运算符和表达式"><a href="#运算符和表达式" class="headerlink" title="运算符和表达式"></a>运算符和表达式</h6><h6 id="变量"><a href="#变量" class="headerlink" title="变量"></a>变量</h6><blockquote>
<ul>
<li>变量名只能包含字符、数字、下划线或美元符号</li>
<li>变量名不能以字母打头</li>
<li>不能将保留字作为变量名</li>
<li>编程风格是以小写字母打头，第二个字母用下划线或者大写开头</li>
</ul>
</blockquote>
<table>
<thead>
<tr>
<th>argument</th>
<th>final</th>
<th>public</th>
<th>boolean</th>
<th>finally</th>
</tr>
</thead>
<tbody><tr>
<td>return</td>
<td>break</td>
<td>float</td>
<td>short</td>
<td>byte</td>
</tr>
<tr>
<td>for</td>
<td>static</td>
<td>case</td>
<td>function</td>
<td>super</td>
</tr>
<tr>
<td>catch</td>
<td>goto</td>
<td>switch</td>
<td>char</td>
<td>if</td>
</tr>
<tr>
<td>synchronized</td>
<td>class</td>
<td>implements</td>
<td>this</td>
<td>cons</td>
</tr>
<tr>
<td>import</td>
<td>throw</td>
<td>continue</td>
<td>in</td>
<td>throws</td>
</tr>
<tr>
<td>debugger</td>
<td>instanceof</td>
<td>transient</td>
<td>default</td>
<td>int</td>
</tr>
<tr>
<td>true</td>
<td>delete</td>
<td>interface</td>
<td>try</td>
<td>do</td>
</tr>
<tr>
<td>let</td>
<td>typeof</td>
<td>double</td>
<td>long</td>
<td>var</td>
</tr>
<tr>
<td>else</td>
<td>native</td>
<td>void</td>
<td>enum</td>
<td>new</td>
</tr>
<tr>
<td>volatile</td>
<td>eval</td>
<td>null</td>
<td>while</td>
<td>export</td>
</tr>
<tr>
<td>package</td>
<td>with</td>
<td>extends</td>
<td>private</td>
<td>yield</td>
</tr>
</tbody></table>
<h6 id="控制结构"><a href="#控制结构" class="headerlink" title="控制结构"></a>控制结构</h6><ul>
<li>if</li>
</ul>
<pre class="line-numbers language-none"><code class="language-none">var color = "red";
if (color == "blue"){
	color = "red";
}else{
	color = "blue";
}
color;<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>
<ul>
<li>for</li>
</ul>
<pre class="line-numbers language-none"><code class="language-none">for(var count = 1;count &lt;= 10;count++){
	console.log("Iteration number" + count);
}<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span></span></code></pre>
<ul>
<li>while</li>
</ul>
<pre class="line-numbers language-none"><code class="language-none">var color = "blue";
while (color == "blue"){
	console.log("Color is still blue.");
	if(Math.random() &gt; 0.5){
		color = 'not blue'
	}
}<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>
<ul>
<li>do</li>
</ul>
<pre class="line-numbers language-none"><code class="language-none">var color = "blue";
do {
	//some stuff
}
while (color != "blue");<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span></span></code></pre>
<h6 id="函数"><a href="#函数" class="headerlink" title="函数"></a>函数</h6><pre class="line-numbers language-none"><code class="language-none">function writeParagraph(myString){
	document.write("&lt;p&gt;" + myString + "&lt;p&gt;");
}<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span></span></code></pre>
<h6 id="数据结构"><a href="#数据结构" class="headerlink" title="数据结构"></a>数据结构</h6><p><img src="https://gitee.com/liangxinixn/guitar/raw/master/blog01/20201011123122.png"></p>
<h6 id="数组"><a href="#数组" class="headerlink" title="数组"></a>数组</h6><p><img src="https://gitee.com/liangxinixn/guitar/raw/master/blog01/20201011123140.png"></p>
<h6 id="对象"><a href="#对象" class="headerlink" title="对象"></a>对象</h6><p><img src="https://gitee.com/liangxinixn/guitar/raw/master/blog01/20201011123234.png"></p>
<h6 id="jQuery"><a href="#jQuery" class="headerlink" title="jQuery"></a>jQuery</h6><p><img src="https://gitee.com/liangxinixn/guitar/raw/master/blog01/20201011123406.png"></p>
<h2 id="二、document打印和出发脚本"><a href="#二、document打印和出发脚本" class="headerlink" title="二、document打印和出发脚本"></a>二、document打印和出发脚本</h2><ul>
<li>可以打印出任意内容，包括识别HTML标签</li>
</ul>
<pre class="line-numbers language-none"><code class="language-none">&lt;head&gt;
    &lt;meta charset="UTF-8"&gt;
    &lt;title&gt;例22-1：第一个JavaScript程序&lt;/title&gt;
&lt;/head&gt;

&lt;body&gt;
    &lt;script type="text/javascript"&gt;
        document.write("&lt;h1&gt;Hello JavaScript!&lt;/h1&gt;");
    &lt;/script&gt;
&lt;/body&gt;
<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>
<ul>
<li>点击事件触发alert框（内部）</li>
</ul>
<pre class="line-numbers language-none"><code class="language-none">&lt;head&gt;
    &lt;meta charset="UTF-8"&gt;
    &lt;title&gt;例22-2：行内式JS示例&lt;/title&gt;
&lt;/head&gt;

&lt;body&gt;
    这里演示内部JavaScript。
    &lt;br/&gt;
    &lt;br/&gt;
    &lt;span onclick="alert('Hello JavaScript!');" style="cursor: pointer;"&gt;显示问候&lt;/span&gt;
&lt;/body&gt;
<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>
<ul>
<li>点击事件触发alert框（外部）</li>
</ul>
<pre class="line-numbers language-none"><code class="language-none">&lt;head&gt;
    &lt;meta charset="UTF-8"&gt;
    &lt;title&gt;例22-3：内部式JS示例&lt;/title&gt;
    &lt;script type="text/JavaScript"&gt;
        function SayHello() { alert("Hello JavaScript!"); }
    &lt;/script&gt;
&lt;/head&gt;

&lt;body&gt;
    这里演示行内（内联）JavaScript。
    &lt;br/&gt;
    &lt;br/&gt;
    &lt;span onclick="SayHello()" style="cursor: pointer;"&gt;显示问候&lt;/span&gt;
&lt;/body&gt;
<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>
<ul>
<li>外部链接引用</li>
</ul>
<pre class="line-numbers language-none"><code class="language-none">&lt;script type="text/javascript" src="JS/demo22-4.js"&gt;&lt;/script&gt;<span aria-hidden="true" class="line-numbers-rows"><span></span></span></code></pre>
<pre class="line-numbers language-none"><code class="language-none">&lt;head&gt;
    &lt;meta charset="UTF-8"&gt;
    &lt;title&gt;例22-4：外部JS示例&lt;/title&gt;
    &lt;script type="text/javascript" src="JS/demo22-4.js"&gt;&lt;/script&gt;
&lt;/head&gt;

&lt;body&gt;
    这里演示外部链接式JavaScript。&lt;br/&gt;&lt;br/&gt;
    &lt;span onclick="SayHello()" style="cursor: pointer;"&gt;显示问候&lt;/span&gt;
&lt;/body&gt;
<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>
<ul>
<li>出错了</li>
</ul>
<pre class="line-numbers language-none"><code class="language-none">&lt;!DOCTYPE html&gt;
&lt;html&gt;

&lt;head&gt;
    &lt;meta charset="UTF-8"&gt;
    &lt;title&gt;例22-5：JS操作元素出错&lt;/title&gt;
    &lt;script type="text/javascript"&gt;
        var btn = document.getElementById("spanHello");
        btn.onclick = function () {
            alert("Hello JavaScript!");
        }
    &lt;/script&gt;
&lt;/head&gt;

&lt;body&gt;
    JS操作元素出错，原因是加载机制问题。&lt;br/&gt;&lt;br/&gt;
    &lt;span id="spanHello" style="cursor: pointer;"&gt;显示问候&lt;/span&gt;
&lt;/body&gt;

&lt;/html&gt;
<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>
<ul>
<li>脚本会直接被触发</li>
</ul>
<pre class="line-numbers language-none"><code class="language-none">&lt;!DOCTYPE html&gt;
&lt;html&gt;

&lt;head&gt;
    &lt;meta charset="UTF-8"&gt;
    &lt;title&gt;例23-1：使用isNaN()判断是否为数值&lt;/title&gt;
    &lt;script type="text/javascript"&gt;
        var name = "Daniel";
        var age = 8;
        if (isNaN(name)) {
            alert("不是数字");
        }
        if (isNaN(age)) {
            alert("不是数字");
        } else {
            alert("是数字");
        }
    &lt;/script&gt;
&lt;/head&gt;

&lt;body&gt;
    使用isNaN()判断是否为数值。
&lt;/body&gt;

&lt;/html&gt;<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>
<h2 id="三、对象的访问"><a href="#三、对象的访问" class="headerlink" title="三、对象的访问"></a>三、对象的访问</h2><pre class="line-numbers language-none"><code class="language-none">&lt;!DOCTYPE html&gt;
&lt;html&gt;

&lt;head&gt;
    &lt;meta charset="UTF-8"&gt;
    &lt;title&gt;例24-1：JS对象的访问&lt;/title&gt;
    &lt;script type="text/javascript"&gt;
        var person = {
            name: "Daniel",
            height: "130cm",
        };
        person.weight = "25kg";
        person.getSlogan = function () {
            return "Never give up!"
        }
        document.write(
            "Name: " + person.name + "&lt;br/&gt;" +
            "Height: " + person.height + "&lt;br/&gt;" +
            "Weight: " + person["weight"] + "&lt;br/&gt;" +
            "Slogan: " + person.getSlogan()
        );
    &lt;/script&gt;
&lt;/head&gt;

&lt;body&gt;
&lt;/body&gt;

&lt;/html&gt;<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>
<pre class="line-numbers language-none"><code class="language-none">&lt;!DOCTYPE html&gt;
&lt;html&gt;

&lt;head&gt;
    &lt;meta charset="UTF-8"&gt;
    &lt;title&gt;例24-2：创建Date对象&lt;/title&gt;
    &lt;script type="text/javascript"&gt;
        //获取当前日期和时间
        var myDate = new Date();
        document.write(myDate);
        ln();

        //获取GTM标准零点过后1533517610185毫秒的时间
        var myDate = new Date(1533517610185);
        document.write(myDate);
        ln();

        //将时间字符串转换为对应的时间对象
        var myDate = new Date("2010-9-25 13:06");
        document.write(myDate);
        ln();

        //将具体的日期、时间参数，构造成Date对象
        var myDate = new Date(2010, 9, 25, 13, 6);
        document.write(myDate);
        ln();


        function ln() {
            document.write("&lt;br/&gt;")
        };
    &lt;/script&gt;
&lt;/head&gt;

&lt;body&gt;
&lt;/body&gt;

&lt;/html&gt;<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>
<pre class="line-numbers language-none"><code class="language-none">&lt;!DOCTYPE html&gt;
&lt;html&gt;

&lt;head&gt;
    &lt;meta charset="UTF-8"&gt;
    &lt;title&gt;例24-3：以“年月日时分钞”的格式显示当前系统日期和时间&lt;/title&gt;
    &lt;script type="text/javascript"&gt;
        //获取当前日期和时间
        var now = new Date();       //获取当前日期和时间对象
        var y = now.getFullYear();  //获取年份（4位）
        var M = now.getMonth() + 1; //获取月份，注意 +1
        var d = now.getDate();      //获取月中的第几天
        var h = now.getHours();     //获取小时
        var m = now.getMinutes();   //获取分钟
        var s = now.getSeconds();   //获取秒数
        var day = now.getDay();     //获取星期几，注意特殊值0
        if (m &lt; 10) m = "0" + m;    //若小于10，则前面补"0"成两位 
        if (d &lt; 10) d = "0" + d;
        if (h &lt; 10) h = "0" + h;
        if (m &lt; 10) m = "0" + m;
        if (s &lt; 10) s = "0" + s;
        if (day == 0) day = "日";
        var str = y + "年" + M + "月" + d + "日 " 
                  + h + ":" + m + ":" + s + " 星期" + day;
        document.write(str);
    &lt;/script&gt;
&lt;/head&gt;

&lt;body&gt;
&lt;/body&gt;

&lt;/html&gt;<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>
<pre class="line-numbers language-none"><code class="language-none">2&lt;!DOCTYPE html&gt;
&lt;html&gt;

&lt;head&gt;
    &lt;meta charset="UTF-8"&gt;
    &lt;title&gt;例24-4：数组常用方法示例&lt;/title&gt;
    &lt;script type="text/javascript"&gt;
        var student = ["刘子栋", "王杰", "James"];
        student.push("Jordan"); //使用push()方法追加新元素
        document.write("数组中的元素： ")
        //遍历输出全部元素
        for (i = 0; i &lt; student.length; i++) {
            document.write(student[i] + "&amp;nbsp;&amp;nbsp;");
        }
        document.write("&lt;br/&gt;反序排列后为： ")
        //反序排列元素
        student.reverse();
        for (i = 0; i &lt; student.length; i++) {
            document.write(student[i] + "&amp;nbsp;&amp;nbsp;");
        }
        document.write("&lt;br/&gt;&lt;br/&gt;用逗号(,)连接成字符串： " + student.join(','));
        document.write("&lt;br/&gt;用加号(+)连接成字符串： " + student.join('+'));
    &lt;/script&gt;
&lt;/head&gt;

&lt;body&gt;
&lt;/body&gt;

&lt;/html&gt;
<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>
<pre class="line-numbers language-none"><code class="language-none">&lt;!DOCTYPE html&gt;
&lt;html&gt;

&lt;head&gt;
    &lt;meta charset="UTF-8"&gt;
    &lt;title&gt;例25-5：Math对象应用示例&lt;/title&gt;
    &lt;script type="text/javascript"&gt;
        var r = 3;
        var area = Math.PI * r * r;
        document.write("半径为3的圆面积为：" + area);
        var areaRounded = Math.round(area * 10) / 10;
        document.write("&lt;br/&gt;保留1位小数为：" + areaRounded);
    &lt;/script&gt;
&lt;/head&gt;

&lt;body&gt;
&lt;/body&gt;

&lt;/html&gt;<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>
<h2 id="四、时间与延迟函数"><a href="#四、时间与延迟函数" class="headerlink" title="四、时间与延迟函数"></a>四、时间与延迟函数</h2><p>解码</p>
<pre class="line-numbers language-none"><code class="language-none">&lt;!DOCTYPE html&gt;
&lt;html&gt;

&lt;head&gt;
    &lt;meta charset="UTF-8"&gt;
    &lt;title&gt;例25-1：escapse()和unescapse()示例&lt;/title&gt;
    &lt;script type="text/javascript"&gt;
        var url = "www.exam.cn/student/examing.aspx?"
        +"id=201810411101&amp;name=刘子栋&amp;setName=WEB开发技术"
        out("原始URL为： " + url);
        var urlEncode = escape(url);
        out("编码后为： " + urlEncode);
        var urlDecode = unescape(urlEncode)
        out("解码还原后： " + urlDecode)

        function out(str) {
            document.write(str + "&lt;br/&gt;");
        }
    &lt;/script&gt;
&lt;/head&gt;

&lt;body&gt;
&lt;/body&gt;

&lt;/html&gt;<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>
<pre class="line-numbers language-none"><code class="language-none">&lt;!DOCTYPE html&gt;
&lt;html&gt;

&lt;head&gt;
    &lt;meta charset="UTF-8"&gt;
    &lt;title&gt;例25-2：setTimeout()示例&lt;/title&gt;
    &lt;script type="text/javascript"&gt;
        function timedMsg() {
            var t = setTimeout("timeout()", 5000);
        }

        function timeout() {
            alert("5 seconds timeout! Let's GO!");
            location.href = "http://www.baidu.com/";
        }
    &lt;/script&gt;
&lt;/head&gt;

&lt;body&gt;
    &lt;form&gt;
        &lt;input type="button" value="5秒后跳转" onClick="timedMsg()"&gt;
    &lt;/form&gt;
    &lt;p&gt;点击上面的按钮。5 秒后会显示一个消息框。&lt;/p&gt;
&lt;/body&gt;

&lt;/html&gt;<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>
<pre class="line-numbers language-none"><code class="language-none">&lt;!DOCTYPE html&gt;
&lt;html&gt;

&lt;head&gt;
    &lt;meta charset="UTF-8"&gt;
    &lt;title&gt;例25-2：setTimeOut()示例&lt;/title&gt;
    &lt;style type="text/css"&gt;
        span#lblSec {
            font-size: 32px;
            color: #fb5404;
            font-family: Verdana, Geneva, Tahoma, sans-serif;
        }
    &lt;/style&gt;
    &lt;script type="text/javascript"&gt;
        var n = 10;
        var lblSec;
        window.onload = function () {
            lblSec = document.getElementById("lblSec");
            countdown();
            setInterval("countdown()", 1000);
        }

        function countdown() {
            lblSec.innerHTML = n;
            if (n &lt;= 0)
                location.href = "http://www.uexam.cn/";
            else {
                n--;
            }
        }
    &lt;/script&gt;
&lt;/head&gt;

&lt;body&gt;
    &lt;h3&gt;恭喜你注册成功，
        &lt;span id="lblSec"&gt;&lt;/span&gt; 后跳转到首页&lt;/h3&gt;
&lt;/body&gt;

&lt;/html&gt;<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>
<pre class="line-numbers language-none"><code class="language-none">&lt;!DOCTYPE html&gt;
&lt;html&gt;

&lt;head&gt;
    &lt;meta charset="UTF-8"&gt;
    &lt;title&gt;例25-4：动态显示当前系统日期和时间&lt;/title&gt;
    &lt;script type="text/javascript" src="JS/demo25-4.js"&gt;&lt;/script&gt;
&lt;/head&gt;

&lt;body&gt;
    当前时间：
    &lt;span id="lblDT"&gt;&lt;/span&gt;
&lt;/body&gt;

&lt;/html&gt;<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>
<pre class="line-numbers language-none"><code class="language-none">var dt;
var days = ["天", "一", "二", "三", "四", "五", "六"];
window.onload = function () {
    dt = document.getElementById("lblDT");
    getDT();
    setInterval("getDT()", 1000);
}

function getDT() {
    var now = new Date();       //获取当前日期和时间对象
    var y = now.getFullYear();  //获取年份（4位）
    var M = now.getMonth() + 1; //获取月份，注意 +1
    var d = now.getDate();      //获取月中的第几天
    var h = now.getHours();     //获取小时
    var m = now.getMinutes();   //获取分钟
    var s = now.getSeconds();   //获取秒数
    var day = now.getDay();     //获取星期几，注意特殊值0
    if (m &lt; 10) m = "0" + m;    //若小于10，则前面补"0"成两位   
    if (d &lt; 10) d = "0" + d;
    if (h &lt; 10) h = "0" + h;
    if (m &lt; 10) m = "0" + m;
    if (s &lt; 10) s = "0" + s;
    var str = y + "年" + M + "月" + d + "日 " +
        h + ":" + m + ":" + s + " 星期" + days[day];
    dt.innerHTML = str;
}<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>
<h2 id="五、dom节点"><a href="#五、dom节点" class="headerlink" title="五、dom节点"></a>五、dom节点</h2><pre class="line-numbers language-none"><code class="language-none">&lt;!DOCTYPE html&gt;
&lt;html lang="en"&gt;

&lt;head&gt;
    &lt;meta charset="UTF-8"&gt;
    &lt;title&gt;DOM文档树&lt;/title&gt;
&lt;/head&gt;

&lt;body&gt;
    &lt;h1&gt;我的标题&lt;/h1&gt;
    &lt;a href="#"&gt;我的链接&lt;/a&gt;
&lt;/body&gt;

&lt;/html&gt;<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>
<pre class="line-numbers language-none"><code class="language-none">&lt;!DOCTYPE html&gt;
&lt;html lang="en"&gt;

&lt;head&gt;
    &lt;meta charset="UTF-8"&gt;
    &lt;title&gt;例26-2：访问DOM节点示例&lt;/title&gt;
&lt;/head&gt;

&lt;body&gt;
    &lt;div id="main"&gt;
        &lt;h3&gt;我是第一个子节点&lt;/h3&gt;
        &lt;div&gt;我是第二个子节点&lt;/div&gt;
        &lt;p&gt;我是最后子节点&lt;/p&gt;
    &lt;/div&gt;
&lt;/body&gt;
&lt;script type="text/javascript"&gt;
    //  获取div对象
    var main = document.getElementById('main');
    //  获取div子节点集合
    var mainChildNodes = main.children;
    document.write("div的子节点个数为：" + mainChildNodes.length);      //获取元素个数
    document.write("&lt;br&gt;" + mainChildNodes[1].tagName);     //获取第2个元素的标签
    document.write("&lt;br&gt;" + mainChildNodes[2].innerHTML);   //获取第3个元素的内容
&lt;/script&gt;

&lt;/html&gt;<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>
<pre class="line-numbers language-none"><code class="language-none">&lt;!DOCTYPE html&gt;
&lt;html lang="en"&gt;

&lt;head&gt;
    &lt;meta charset="UTF-8"&gt;
    &lt;title&gt;例26-3：修改DOM节点示例&lt;/title&gt;
&lt;/head&gt;

&lt;body&gt;
    &lt;div id="main"&gt;
        &lt;a href="http://www.cdu.edu.cn/"&gt;我是第一个子节点&lt;/a&gt;
        &lt;div&gt;我是第二个子节点&lt;/div&gt;
        &lt;p&gt;我是最后子节点&lt;/p&gt;
    &lt;/div&gt;
&lt;/body&gt;


&lt;/html&gt;<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>
<pre class="line-numbers language-none"><code class="language-none">&lt;!DOCTYPE html&gt;
&lt;html lang="en"&gt;

&lt;head&gt;
    &lt;meta charset="UTF-8"&gt;
    &lt;title&gt;例26-4：window对象应用示例（获取浏览器的宽高）&lt;/title&gt;
    &lt;script tyep="text/javascript"&gt;
        var w = window.innerWidth || document.body.clientWidth ||
            document.documentElement.clientWidth;
        var h = window.innerHeight || document.body.clientHeight ||
            document.documentElement.clientHeight;
        document.write("浏览器窗口宽: " + w + "px, 高: " + h + "px");
    &lt;/script&gt;
&lt;/head&gt;

&lt;body&gt;
&lt;/body&gt;


&lt;/html&gt;<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>
<pre class="line-numbers language-none"><code class="language-none">&lt;!DOCTYPE html&gt;
&lt;html lang="en"&gt;

&lt;head&gt;
    &lt;meta charset="UTF-8"&gt;
    &lt;title&gt;例26-5：访问navigator对象示例&lt;/title&gt;
    &lt;script tyep="text/javascript"&gt;
        // out("&lt;p&gt;浏览器代号: " + navigator.appCodeName + "&lt;/p&gt;");
        // out("&lt;p&gt;浏览器名称: " + navigator.appName + "&lt;/p&gt;");
        // out("&lt;p&gt;浏览器版本: " + navigator.appVersion + "&lt;/p&gt;");
        // out("&lt;p&gt;启用Cookies: " + navigator.cookieEnabled + "&lt;/p&gt;");

var aWidth = screen.availWidth;
var aHeight = screen.availHeight;
var sWidth = screen.width;
var sHeight = screen.height;

var n=0

out(location.protocol)
        function out(str) {
            document.write(str + "&lt;br/&gt;");
        }

    function reload(){
        if(n&lt;5){
        out(n+"……");
        n=n+1;
        }else{
            location.reload();
        }
                setTimeout("reload()",1000);
    }

    function write(){
        if(n&lt;5){
        out(n+"……");
        n=n+1;
        }else{
            location.reload();
        }
    }
&lt;/script&gt;
&lt;/head&gt;

&lt;body&gt;
    &lt;input type="button" value="重新加载" onclick="reload()"&gt;
&lt;/body&gt;


&lt;/html&gt;<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>
<h2 id="六、事件"><a href="#六、事件" class="headerlink" title="六、事件"></a>六、事件</h2><pre class="line-numbers language-none"><code class="language-none">&lt;!DOCTYPE html&gt;
&lt;html&gt;

&lt;head&gt;
    &lt;meta charset="UTF-8"&gt;
    &lt;title&gt;例27-1：事件绑定示例&lt;/title&gt;

&lt;/head&gt;

&lt;body&gt;
    &lt;INPUT type="button" value="静态绑定1" onClick="alert('静态1');"&gt;
    &lt;br/&gt;
    &lt;br/&gt;
    &lt;INPUT type="button" value="静态绑定2" onClick="popMsg()"&gt;
    &lt;br/&gt;
    &lt;br/&gt;
    &lt;INPUT type="button" value="动态绑定1" id="btnDemo1"&gt;
    &lt;br/&gt;
    &lt;br/&gt;
    &lt;INPUT type="button" value="动态绑定2" id="btnDemo2"&gt;
    &lt;br/&gt;
    &lt;br/&gt;
&lt;/body&gt;
&lt;script type="text/javascript"&gt;
    function popMsg() {
        alert("静态绑定事件2");
    }

    var btn1 = document.getElementById("btnDemo1");
    btn1.onclick = function () {
        alert("动态绑定事件，匿名函数形式。")
    }

    var btn2 = document.getElementById("btnDemo2");
    btn2.onclick = myHandler;
    function myHandler() {
        alert("动态绑定事件，普通函数形式。")
    }
&lt;/script&gt;

&lt;/html&gt;<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>
<pre class="line-numbers language-none"><code class="language-none">&lt;!DOCTYPE html&gt;
&lt;html&gt;

&lt;head&gt;
    &lt;meta charset="UTF-8"&gt;
    &lt;title&gt;例27-2：Load事件优化JS代码位置&lt;/title&gt;
    &lt;script type="text/javascript"&gt;
        window.onload = init;

        function init() {
            var btn1 = document.getElementById("btnDemo1");
            btn1.onclick = function () {
                alert("动态绑定事件，匿名函数形式。")
            }

            var btn2 = document.getElementById("btnDemo2");
            btn2.onclick = myHandler;

            function myHandler() {
                alert("动态绑定事件，普通函数形式。")
            }
        }

        function popMsg() {
            alert("静态绑定事件2");
        }
    &lt;/script&gt;
&lt;/head&gt;

&lt;body&gt;
    &lt;INPUT type="button" value="静态绑定1" onClick="alert('静态1');"&gt;
    &lt;br/&gt;
    &lt;br/&gt;
    &lt;INPUT type="button" value="静态绑定2" onClick="popMsg()"&gt;
    &lt;br/&gt;
    &lt;br/&gt;
    &lt;INPUT type="button" value="动态绑定1" id="btnDemo1"&gt;
    &lt;br/&gt;
    &lt;br/&gt;
    &lt;INPUT type="button" value="动态绑定2" id="btnDemo2"&gt;
    &lt;br/&gt;
    &lt;br/&gt;
&lt;/body&gt;


&lt;/html&gt;<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>
<pre class="line-numbers language-none"><code class="language-none">&lt;!DOCTYPE html&gt;
&lt;html&gt;

&lt;head&gt;
    &lt;meta charset="UTF-8"&gt;
    &lt;title&gt;例27-3：BeforeUnLoad事件示例&lt;/title&gt;
    &lt;script type="text/javascript"&gt;
        window.onbeforeunload = function () {
            if (window.event)
                window.event.returnValue = "确定关闭窗口吗？";
        }
    &lt;/script&gt;
&lt;/head&gt;

&lt;body&gt;
    UnLoad事件示例，关闭窗口会弹出确认对话框。
    &lt;br/&gt;
    &lt;input type="button" onclick="window.close()" oncli value="关闭页面" /&gt;
&lt;/body&gt;


&lt;/html&gt;<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>
<pre class="line-numbers language-none"><code class="language-none">&lt;!DOCTYPE html&gt;
&lt;html&gt;

&lt;head&gt;
    &lt;meta charset="UTF-8"&gt;
    &lt;title&gt;例27-4：鼠标移到按钮上方改变按钮样式&lt;/title&gt;
    &lt;style type="text/css"&gt;
        #btnDemo {
            border: none;
            font-size: 26px;
            padding: 5px 10px;
            border: 2px solid #999;
        }

        .out {
            background-color: #eee;
            font-family: 微软雅黑;
            color: blue;
        }

        .over {
            background-color: #f94306;
            font-family: 楷体;
            color: white;
        }
    &lt;/style&gt;
    &lt;script type="text/javascript"&gt;
        window.onload = init;

        function init() {
            var btn = document.getElementById("btnDemo");
            btn.onmouseover = function () {
                btn.className = "over";
            }
            btn.onmouseout = function () {
                btn.className = "out";
            }
        }
    &lt;/script&gt;
&lt;/head&gt;

&lt;body&gt;
    &lt;input id="btnDemo" class="out" type="button" value="鼠标移上来，改变样式" /&gt;
&lt;/body&gt;


&lt;/html&gt;<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>
<pre class="line-numbers language-none"><code class="language-none">&lt;!DOCTYPE html&gt;
&lt;html&gt;

&lt;head&gt;
    &lt;meta charset="UTF-8"&gt;
    &lt;title&gt;例27-5：鼠标移到表格上方时行变色&lt;/title&gt;
    &lt;style type="text/css"&gt;
        table, td, th {
            border: 1px solid #999;
            border-collapse: collapse;
            /*合并边框*/
        }
    &lt;/style&gt;

    &lt;script type="text/javascript"&gt;
        window.onload = init;

        function init() {
            var trs = document.getElementById("tbl").getElementsByTagName("tr");
            var oldBG;
            for (n in trs) {
                trs[n].onmouseover = function () {
                    oldBG = this.style.background; //记录旧颜色
                    this.style.background = "#ccc"; //显示新颜色
                }
                trs[n].onmouseout = function () {
                    this.style.background = oldBG; //恢复旧颜色
                }
            }
        }
    &lt;/script&gt;
&lt;/head&gt;

&lt;body&gt;
    &lt;table id="tbl"&gt;
        &lt;caption&gt;表格的标题&lt;/caption&gt;
        &lt;tr&gt;
            &lt;th&gt;学号&lt;/th&gt;
            &lt;th&gt;姓名&lt;/th&gt;
            &lt;th&gt;年龄&lt;/th&gt;
        &lt;/tr&gt;
        &lt;tr&gt;
            &lt;td&gt;2018106621101&lt;/td&gt;
            &lt;td&gt;刘子栋&lt;/td&gt;
            &lt;td&gt;20&lt;/td&gt;
        &lt;/tr&gt;
        &lt;tr&gt;
            &lt;td&gt;2018106621102&lt;/td&gt;
            &lt;td&gt;James Harden&lt;/td&gt;
            &lt;td&gt;21&lt;/td&gt;
        &lt;/tr&gt;
    &lt;/table&gt;

&lt;/body&gt;


&lt;/html&gt;<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>
<pre class="line-numbers language-none"><code class="language-none">&lt;!DOCTYPE html&gt;
&lt;html&gt;

&lt;head&gt;
    &lt;meta charset="UTF-8"&gt;
    &lt;title&gt;例27-6：输入时的键盘事件&lt;/title&gt;
    &lt;script type="text/javascript" src="JS/demo27-6.js"&gt;&lt;/script&gt;
&lt;/head&gt;

&lt;body&gt;
    &lt;p&gt;请按下回车键提交用户名和密码&lt;/p&gt;
    &lt;div&gt;用户名：
        &lt;input type="text" id="txtID" onkeydown="idKeyDown()"&gt;
    &lt;/div&gt;
    &lt;div&gt;密　码：
        &lt;input type="password" id="txtPWD" onkeydown="pwdKeyDown()"&gt;
    &lt;/div&gt;
    &lt;div&gt;
        &lt;input type="button" value="登  录" onclick="submit()" &lt;/div&gt;

&lt;/body&gt;


&lt;/html&gt;<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>
<pre class="line-numbers language-none"><code class="language-none">&lt;!DOCTYPE html&gt;
&lt;html&gt;

&lt;head&gt;
    &lt;meta charset="UTF-8"&gt;
    &lt;title&gt;例27-7：表单元素的Focus和Blur事件&lt;/title&gt;
    &lt;script type="text/javascript"&gt;
        var txtID, tips;
        window.onload = init;

        function init() {
            txtID = document.getElementById("txtID");
            tips = document.getElementById("tips");
            txtID.onfocus = Focus;
            txtID.onblur = Blur;
        }

        function Focus() {
            tips.innerHTML = "正在输入用户名……";
        }

        function Blur() {
            if (txtID.value != "") {
                tips.innerHTML = "用户名输入完成";
            } else {
                tips.innerHTML = "用户名不能为空";
            }
        }
    &lt;/script&gt;
&lt;/head&gt;

&lt;body&gt;
    &lt;div&gt;用户名：&lt;input type="text" id="txtID"&gt;&lt;br/&gt;&lt;/div&gt;
    &lt;span id="tips"&gt;请输入用户名&lt;/span&gt;
&lt;/body&gt;


&lt;/html&gt;<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>
<pre class="line-numbers language-none"><code class="language-none">&lt;!DOCTYPE html&gt;
&lt;html&gt;

&lt;head&gt;
    &lt;meta charset="UTF-8"&gt;
    &lt;title&gt;例27-8：Change事件实现下拉列表的联动&lt;/title&gt;
    &lt;script type="text/javascript" src="JS/demo27-8.js"&gt;&lt;/script&gt;
&lt;/head&gt;

&lt;body&gt;
    &lt;select id="province" onchange="changeCity()"&gt;
        &lt;option value="0"&gt;--请选择--&lt;/option&gt;
        &lt;option value="1"&gt;四川&lt;/option&gt;
        &lt;option value="2"&gt;浙江&lt;/option&gt;
    &lt;/select&gt;
    &lt;select id="city"&gt;
        &lt;option value="0"&gt;--请选择--&lt;/option&gt;
    &lt;/select&gt;


&lt;/body&gt;


&lt;/html&gt;<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>
<pre class="line-numbers language-none"><code class="language-none">var txtID, txtPWD;
window.onload = function () {
    txtID = document.getElementById("txtID");
    txtPWD = document.getElementById("txtPWD");
}

//用户名文本框上按回车键，跳到密码框
function idKeyDown() {
    if (window.event.keyCode == 13) {
        txtPWD.focus();
    }
}

//密码文本框上按回车键，提交
function pwdKeyDown() {
    if (window.event.keyCode == 13) {
        submit();
    }
}

function submit() {
    var id = txtID.value;
    var pwd = txtPWD.value;
    if (id == "") {
        alert("用户名不能为空！")
        txtID.focus();
    } else if (pwd == "") {
        alert("密码不能为空！")
        txtPWD.focus();
    } else {
        alert("开始登录验证……");
    }

}<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>
<pre class="line-numbers language-none"><code class="language-none">var city, province;
window.onload = function () {
    city = document.getElementById("city");
    province = document.getElementById("province");
}
var cityObject = {
    SiChuan: ["成都", "绵阳", "德阳"],
    ZheJiang: ["杭州", "宁波"]
};

function changeCity() {
    if (city.children.length &gt; 1) {
        var length = city.children.length;
        for (var j = 1; j &lt; length; j++) {
            city.removeChild(city.children[1]);
        }
    }
    addNode();
}

function addNode() {
    if (province.value == 1) {
        for (var i = 0; i &lt; cityObject.SiChuan.length; i++) {
            addOption(cityObject.SiChuan[i]);
        }
    }
    if (province.value == 2) {
        for (var i = 0; i &lt; cityObject.ZheJiang.length; i++) {
            addOption(cityObject.ZheJiang[i]);
        }
    }
}

function addOption(object) {
    var option = document.createElement("option");
    node = document.createTextNode(object);
    option.appendChild(node);
    city.appendChild(option);
}<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>

                
            </div>
            <hr/>

            

    <div class="reprint" id="reprint-statement">
        
            <div class="reprint__author">
                <span class="reprint-meta" style="font-weight: bold;">
                    <i class="fas fa-user">
                        文章作者:
                    </i>
                </span>
                <span class="reprint-info">
                    <a href="/about" rel="external nofollow noreferrer">lxx</a>
                </span>
            </div>
            <div class="reprint__type">
                <span class="reprint-meta" style="font-weight: bold;">
                    <i class="fas fa-link">
                        文章链接:
                    </i>
                </span>
                <span class="reprint-info">
                    <a href="http://xinxinliang.github.io/2021/03/17/js-yu-fa-zong-jie/">http://xinxinliang.github.io/2021/03/17/js-yu-fa-zong-jie/</a>
                </span>
            </div>
            <div class="reprint__notice">
                <span class="reprint-meta" style="font-weight: bold;">
                    <i class="fas fa-copyright">
                        版权声明:
                    </i>
                </span>
                <span class="reprint-info">
                    本博客所有文章除特別声明外，均采用
                    <a href="https://creativecommons.org/licenses/by/4.0/deed.zh" rel="external nofollow noreferrer" target="_blank">CC BY 4.0</a>
                    许可协议。转载请注明来源
                    <a href="/about" target="_blank">lxx</a>
                    !
                </span>
            </div>
        
    </div>

    <script async defer>
      document.addEventListener("copy", function (e) {
        let toastHTML = '<span>复制成功，请遵循本文的转载规则</span><button class="btn-flat toast-action" onclick="navToReprintStatement()" style="font-size: smaller">查看</a>';
        M.toast({html: toastHTML})
      });

      function navToReprintStatement() {
        $("html, body").animate({scrollTop: $("#reprint-statement").offset().top - 80}, 800);
      }
    </script>



            <div class="tag_share" style="display: block;">
                <div class="post-meta__tag-list" style="display: inline-block;">
                    
                        <div class="article-tag">
                            
                                <a href="/tags/%E8%AE%B0%E5%BD%95/">
                                    <span class="chip bg-color">记录</span>
                                </a>
                            
                                <a href="/tags/JavaScrip/">
                                    <span class="chip bg-color">JavaScrip</span>
                                </a>
                            
                        </div>
                    
                </div>
                <div class="post_share" style="zoom: 80%; width: fit-content; display: inline-block; float: right; margin: -0.15rem 0;">
                    <link rel="stylesheet" type="text/css" href="/libs/share/css/share.min.css">
<div id="article-share">

    
    <div class="social-share" data-sites="twitter,facebook,google,qq,qzone,wechat,weibo,douban,linkedin" data-wechat-qrcode-helper="<p>微信扫一扫即可分享！</p>"></div>
    <script src="/libs/share/js/social-share.min.js"></script>
    

    

</div>

                </div>
            </div>
            
                <style>
    #reward {
        margin: 40px 0;
        text-align: center;
    }

    #reward .reward-link {
        font-size: 1.4rem;
        line-height: 38px;
    }

    #reward .btn-floating:hover {
        box-shadow: 0 6px 12px rgba(0, 0, 0, 0.2), 0 5px 15px rgba(0, 0, 0, 0.2);
    }

    #rewardModal {
        width: 320px;
        height: 350px;
    }

    #rewardModal .reward-title {
        margin: 15px auto;
        padding-bottom: 5px;
    }

    #rewardModal .modal-content {
        padding: 10px;
    }

    #rewardModal .close {
        position: absolute;
        right: 15px;
        top: 15px;
        color: rgba(0, 0, 0, 0.5);
        font-size: 1.3rem;
        line-height: 20px;
        cursor: pointer;
    }

    #rewardModal .close:hover {
        color: #ef5350;
        transform: scale(1.3);
        -moz-transform:scale(1.3);
        -webkit-transform:scale(1.3);
        -o-transform:scale(1.3);
    }

    #rewardModal .reward-tabs {
        margin: 0 auto;
        width: 210px;
    }

    .reward-tabs .tabs {
        height: 38px;
        margin: 10px auto;
        padding-left: 0;
    }

    .reward-content ul {
        padding-left: 0 !important;
    }

    .reward-tabs .tabs .tab {
        height: 38px;
        line-height: 38px;
    }

    .reward-tabs .tab a {
        color: #fff;
        background-color: #ccc;
    }

    .reward-tabs .tab a:hover {
        background-color: #ccc;
        color: #fff;
    }

    .reward-tabs .wechat-tab .active {
        color: #fff !important;
        background-color: #22AB38 !important;
    }

    .reward-tabs .alipay-tab .active {
        color: #fff !important;
        background-color: #019FE8 !important;
    }

    .reward-tabs .reward-img {
        width: 210px;
        height: 210px;
    }
</style>

<div id="reward">
    <a href="#rewardModal" class="reward-link modal-trigger btn-floating btn-medium waves-effect waves-light red">赏</a>

    <!-- Modal Structure -->
    <div id="rewardModal" class="modal">
        <div class="modal-content">
            <a class="close modal-close"><i class="fas fa-times"></i></a>
            <h4 class="reward-title">你的赏识是我前进的动力</h4>
            <div class="reward-content">
                <div class="reward-tabs">
                    <ul class="tabs row">
                        <li class="tab col s6 alipay-tab waves-effect waves-light"><a href="#alipay">支付宝</a></li>
                        <li class="tab col s6 wechat-tab waves-effect waves-light"><a href="#wechat">微 信</a></li>
                    </ul>
                    <div id="alipay">
                        <img src="https://gitee.com/liangxinixn/guitar/raw/master/image01/20200726220206.png" class="reward-img" alt="支付宝打赏二维码">
                    </div>
                    <div id="wechat">
                        <img src="https://gitee.com/liangxinixn/guitar/raw/master/image01/20200726220308.png" class="reward-img" alt="微信打赏二维码">
                    </div>
                </div>
            </div>
        </div>
    </div>
</div>

<script>
    $(function () {
        $('.tabs').tabs();
    });
</script>

            
        </div>
    </div>

    

    

    

    

    

    

    

    

    

<article id="prenext-posts" class="prev-next articles">
    <div class="row article-row">
        
        <div class="article col s12 m6" data-aos="fade-up">
            <div class="article-badge left-badge text-color">
                <i class="fas fa-chevron-left"></i>&nbsp;上一篇</div>
            <div class="card">
                <a href="/2021/03/17/picgo-github-tu-chuang/">
                    <div class="card-image">
                        
                        <img src="https://cdn.jsdelivr.net/gh/liangxinxin5102/image2/cartoon01/wallhaven-ym921l.jpg" class="responsive-img" alt="picGo+github/gitee 图床">
                        
                        <span class="card-title">picGo+github/gitee 图床</span>
                    </div>
                </a>
                <div class="card-content article-content">
                    <div class="summary block-with-text">
                        
                            
                        
                    </div>
                    <div class="publish-info">
                        <span class="publish-date">
                            <i class="far fa-clock fa-fw icon-date"></i>2021-03-17
                        </span>
                        <span class="publish-author">
                            
                            <i class="fas fa-bookmark fa-fw icon-category"></i>
                            
                            <a href="/categories/%E5%B7%A5%E5%85%B7/" class="post-category">
                                    工具
                                </a>
                            
                            
                        </span>
                    </div>
                </div>
                
                <div class="card-action article-tags">
                    
                    <a href="/tags/%E6%8E%A8%E8%8D%90/">
                        <span class="chip bg-color">推荐</span>
                    </a>
                    
                    <a href="/tags/%E5%9B%BE%E5%BA%8A/">
                        <span class="chip bg-color">图床</span>
                    </a>
                    
                    <a href="/tags/picgo/">
                        <span class="chip bg-color">picgo</span>
                    </a>
                    
                </div>
                
            </div>
        </div>
        
        
        <div class="article col s12 m6" data-aos="fade-up">
            <div class="article-badge right-badge text-color">
                下一篇&nbsp;<i class="fas fa-chevron-right"></i>
            </div>
            <div class="card">
                <a href="/2021/03/17/css-yu-fa-zong-jie/">
                    <div class="card-image">
                        
                        <img src="https://cdn.jsdelivr.net/gh/liangxinxin5102/image2/cartoon01/wallhaven-vm9zp8.jpg" class="responsive-img" alt="CSS语法总结">
                        
                        <span class="card-title">CSS语法总结</span>
                    </div>
                </a>
                <div class="card-content article-content">
                    <div class="summary block-with-text">
                        
                            
                        
                    </div>
                    <div class="publish-info">
                            <span class="publish-date">
                                <i class="far fa-clock fa-fw icon-date"></i>2021-03-17
                            </span>
                        <span class="publish-author">
                            
                            <i class="fas fa-bookmark fa-fw icon-category"></i>
                            
                            <a href="/categories/web/" class="post-category">
                                    web
                                </a>
                            
                            
                        </span>
                    </div>
                </div>
                
                <div class="card-action article-tags">
                    
                    <a href="/tags/%E8%AE%B0%E5%BD%95/">
                        <span class="chip bg-color">记录</span>
                    </a>
                    
                    <a href="/tags/CSS/">
                        <span class="chip bg-color">CSS</span>
                    </a>
                    
                </div>
                
            </div>
        </div>
        
    </div>
</article>

</div>


<script>
    $('#articleContent').on('copy', function (e) {
        // IE8 or earlier browser is 'undefined'
        if (typeof window.getSelection === 'undefined') return;

        var selection = window.getSelection();
        // if the selection is short let's not annoy our users.
        if (('' + selection).length < Number.parseInt('120')) {
            return;
        }

        // create a div outside of the visible area and fill it with the selected text.
        var bodyElement = document.getElementsByTagName('body')[0];
        var newdiv = document.createElement('div');
        newdiv.style.position = 'absolute';
        newdiv.style.left = '-99999px';
        bodyElement.appendChild(newdiv);
        newdiv.appendChild(selection.getRangeAt(0).cloneContents());

        // we need a <pre> tag workaround.
        // otherwise the text inside "pre" loses all the line breaks!
        if (selection.getRangeAt(0).commonAncestorContainer.nodeName === 'PRE') {
            newdiv.innerHTML = "<pre>" + newdiv.innerHTML + "</pre>";
        }

        var url = document.location.href;
        newdiv.innerHTML += '<br />'
            + '来源: 头号咸鱼<br />'
            + '文章作者: lxx<br />'
            + '文章链接: <a href="' + url + '">' + url + '</a><br />'
            + '本文章著作权归作者所有，任何形式的转载都请注明出处。';

        selection.selectAllChildren(newdiv);
        window.setTimeout(function () {bodyElement.removeChild(newdiv);}, 200);
    });
</script>


<!-- 代码块功能依赖 -->
<script type="text/javascript" src="/libs/codeBlock/codeBlockFuction.js"></script>

<!-- 代码语言 -->

<script type="text/javascript" src="/libs/codeBlock/codeLang.js"></script>


<!-- 代码块复制 -->

<script type="text/javascript" src="/libs/codeBlock/codeCopy.js"></script>


<!-- 代码块收缩 -->

<script type="text/javascript" src="/libs/codeBlock/codeShrink.js"></script>


    </div>
    <div id="toc-aside" class="expanded col l3 hide-on-med-and-down">
        <div class="toc-widget card" style="background-color: white;">
            <div class="toc-title"><i class="far fa-list-alt"></i>&nbsp;&nbsp;目录</div>
            <div id="toc-content"></div>
        </div>
    </div>
</div>

<!-- TOC 悬浮按钮. -->

<div id="floating-toc-btn" class="hide-on-med-and-down">
    <a class="btn-floating btn-large bg-color">
        <i class="fas fa-list-ul"></i>
    </a>
</div>


<script src="/libs/tocbot/tocbot.min.js"></script>
<script>
    $(function () {
        tocbot.init({
            tocSelector: '#toc-content',
            contentSelector: '#articleContent',
            headingsOffset: -($(window).height() * 0.4 - 45),
            collapseDepth: Number('0'),
            headingSelector: 'h2, h3, h4'
        });

        // modify the toc link href to support Chinese.
        let i = 0;
        let tocHeading = 'toc-heading-';
        $('#toc-content a').each(function () {
            $(this).attr('href', '#' + tocHeading + (++i));
        });

        // modify the heading title id to support Chinese.
        i = 0;
        $('#articleContent').children('h2, h3, h4').each(function () {
            $(this).attr('id', tocHeading + (++i));
        });

        // Set scroll toc fixed.
        let tocHeight = parseInt($(window).height() * 0.4 - 64);
        let $tocWidget = $('.toc-widget');
        $(window).scroll(function () {
            let scroll = $(window).scrollTop();
            /* add post toc fixed. */
            if (scroll > tocHeight) {
                $tocWidget.addClass('toc-fixed');
            } else {
                $tocWidget.removeClass('toc-fixed');
            }
        });

        
        /* 修复文章卡片 div 的宽度. */
        let fixPostCardWidth = function (srcId, targetId) {
            let srcDiv = $('#' + srcId);
            if (srcDiv.length === 0) {
                return;
            }

            let w = srcDiv.width();
            if (w >= 450) {
                w = w + 21;
            } else if (w >= 350 && w < 450) {
                w = w + 18;
            } else if (w >= 300 && w < 350) {
                w = w + 16;
            } else {
                w = w + 14;
            }
            $('#' + targetId).width(w);
        };

        // 切换TOC目录展开收缩的相关操作.
        const expandedClass = 'expanded';
        let $tocAside = $('#toc-aside');
        let $mainContent = $('#main-content');
        $('#floating-toc-btn .btn-floating').click(function () {
            if ($tocAside.hasClass(expandedClass)) {
                $tocAside.removeClass(expandedClass).hide();
                $mainContent.removeClass('l9');
            } else {
                $tocAside.addClass(expandedClass).show();
                $mainContent.addClass('l9');
            }
            fixPostCardWidth('artDetail', 'prenext-posts');
        });
        
    });
</script>

    

</main>




    <footer class="page-footer bg-color">
    
        <link rel="stylesheet" href="/libs/aplayer/APlayer.min.css">
<style>
    .aplayer .aplayer-lrc p {
        
        display: none;
        
        font-size: 12px;
        font-weight: 700;
        line-height: 16px !important;
    }

    .aplayer .aplayer-lrc p.aplayer-lrc-current {
        
        display: none;
        
        font-size: 15px;
        color: #42b983;
    }

    
    .aplayer.aplayer-fixed.aplayer-narrow .aplayer-body {
        left: -66px !important;
    }

    .aplayer.aplayer-fixed.aplayer-narrow .aplayer-body:hover {
        left: 0px !important;
    }

    
</style>
<div class="">
    
    <div class="row">
        <meting-js class="col l8 offset-l2 m10 offset-m1 s12"
                   server="netease"
                   type="playlist"
                   id="503838841"
                   fixed='true'
                   autoplay='false'
                   theme='#42b983'
                   loop='all'
                   order='random'
                   preload='auto'
                   volume='0.7'
                   list-folded='true'
        >
        </meting-js>
    </div>
</div>

<script src="/libs/aplayer/APlayer.min.js"></script>
<script src="https://cdn.jsdelivr.net/npm/meting@2/dist/Meting.min.js"></script>

    
    <div class="container row center-align" style="margin-bottom: 0px !important;">
        <div class="col s12 m8 l8 copy-right">
            Copyright&nbsp;&copy;
            
                <span id="year">2021</span>
            
            <span id="year">2021</span>
            <a href="/about" target="_blank">lxx</a>
            |&nbsp;Powered by&nbsp;<a href="https://hexo.io/" target="_blank">Hexo</a>
            |&nbsp;Theme&nbsp;<a href="https://github.com/blinkfox/hexo-theme-matery" target="_blank">Matery</a>
            <br>
            
            &nbsp;<i class="fas fa-chart-area"></i>&nbsp;站点总字数:&nbsp;<span
                class="white-color">272.8k</span>&nbsp;字
            
            
            
            
            
            
            <span id="busuanzi_container_site_pv">
                |&nbsp;<i class="far fa-eye"></i>&nbsp;总访问量:&nbsp;<span id="busuanzi_value_site_pv"
                    class="white-color"></span>&nbsp;次
            </span>
            
            
            <span id="busuanzi_container_site_uv">
                |&nbsp;<i class="fas fa-users"></i>&nbsp;总访问人数:&nbsp;<span id="busuanzi_value_site_uv"
                    class="white-color"></span>&nbsp;人
            </span>
            
            <br>
            
            <br>
            
        </div>
        <div class="col s12 m4 l4 social-link social-statis">
    <a href="https://github.com/xinxinliang" class="tooltipped" target="_blank" data-tooltip="访问我的GitHub" data-position="top" data-delay="50">
        <i class="fab fa-github"></i>
    </a>



    <a href="mailto:1974733812@qq.com" class="tooltipped" target="_blank" data-tooltip="邮件联系我" data-position="top" data-delay="50">
        <i class="fas fa-envelope-open"></i>
    </a>







    <a href="tencent://AddContact/?fromId=50&fromSubId=1&subcmd=all&uin=1974733812" class="tooltipped" target="_blank" data-tooltip="QQ联系我: 1974733812" data-position="top" data-delay="50">
        <i class="fab fa-qq"></i>
    </a>







    <a href="/atom.xml" class="tooltipped" target="_blank" data-tooltip="RSS 订阅" data-position="top" data-delay="50">
        <i class="fas fa-rss"></i>
    </a>

</div>
    </div>
</footer>

<div class="progress-bar"></div>


    <!-- 搜索遮罩框 -->
<div id="searchModal" class="modal">
    <div class="modal-content">
        <div class="search-header">
            <span class="title"><i class="fas fa-search"></i>&nbsp;&nbsp;搜索</span>
            <input type="search" id="searchInput" name="s" placeholder="请输入搜索的关键字"
                   class="search-input">
        </div>
        <div id="searchResult"></div>
    </div>
</div>

<script type="text/javascript">
$(function () {
    var searchFunc = function (path, search_id, content_id) {
        'use strict';
        $.ajax({
            url: path,
            dataType: "xml",
            success: function (xmlResponse) {
                // get the contents from search data
                var datas = $("entry", xmlResponse).map(function () {
                    return {
                        title: $("title", this).text(),
                        content: $("content", this).text(),
                        url: $("url", this).text()
                    };
                }).get();
                var $input = document.getElementById(search_id);
                var $resultContent = document.getElementById(content_id);
                $input.addEventListener('input', function () {
                    var str = '<ul class=\"search-result-list\">';
                    var keywords = this.value.trim().toLowerCase().split(/[\s\-]+/);
                    $resultContent.innerHTML = "";
                    if (this.value.trim().length <= 0) {
                        return;
                    }
                    // perform local searching
                    datas.forEach(function (data) {
                        var isMatch = true;
                        var data_title = data.title.trim().toLowerCase();
                        var data_content = data.content.trim().replace(/<[^>]+>/g, "").toLowerCase();
                        var data_url = data.url;
                        data_url = data_url.indexOf('/') === 0 ? data.url : '/' + data_url;
                        var index_title = -1;
                        var index_content = -1;
                        var first_occur = -1;
                        // only match artiles with not empty titles and contents
                        if (data_title !== '' && data_content !== '') {
                            keywords.forEach(function (keyword, i) {
                                index_title = data_title.indexOf(keyword);
                                index_content = data_content.indexOf(keyword);
                                if (index_title < 0 && index_content < 0) {
                                    isMatch = false;
                                } else {
                                    if (index_content < 0) {
                                        index_content = 0;
                                    }
                                    if (i === 0) {
                                        first_occur = index_content;
                                    }
                                }
                            });
                        }
                        // show search results
                        if (isMatch) {
                            str += "<li><a href='" + data_url + "' class='search-result-title'>" + data_title + "</a>";
                            var content = data.content.trim().replace(/<[^>]+>/g, "");
                            if (first_occur >= 0) {
                                // cut out 100 characters
                                var start = first_occur - 20;
                                var end = first_occur + 80;
                                if (start < 0) {
                                    start = 0;
                                }
                                if (start === 0) {
                                    end = 100;
                                }
                                if (end > content.length) {
                                    end = content.length;
                                }
                                var match_content = content.substr(start, end);
                                // highlight all keywords
                                keywords.forEach(function (keyword) {
                                    var regS = new RegExp(keyword, "gi");
                                    match_content = match_content.replace(regS, "<em class=\"search-keyword\">" + keyword + "</em>");
                                });

                                str += "<p class=\"search-result\">" + match_content + "...</p>"
                            }
                            str += "</li>";
                        }
                    });
                    str += "</ul>";
                    $resultContent.innerHTML = str;
                });
            }
        });
    };

    searchFunc('/search.xml', 'searchInput', 'searchResult');
});
</script>

    <!-- 回到顶部按钮 -->
<div id="backTop" class="top-scroll">
    <a class="btn-floating btn-large waves-effect waves-light" href="#!">
        <i class="fas fa-arrow-up"></i>
    </a>
</div>


    <script src="/libs/materialize/materialize.min.js"></script>
    <script src="/libs/masonry/masonry.pkgd.min.js"></script>
    <script src="/libs/aos/aos.js"></script>
    <script src="/libs/scrollprogress/scrollProgress.min.js"></script>
    <script src="/libs/lightGallery/js/lightgallery-all.min.js"></script>
    <script src="/js/matery.js"></script>

    <!-- Baidu Analytics -->

    <!-- Baidu Push -->

<script>
    (function () {
        var bp = document.createElement('script');
        var curProtocol = window.location.protocol.split(':')[0];
        if (curProtocol === 'https') {
            bp.src = 'https://zz.bdstatic.com/linksubmit/push.js';
        } else {
            bp.src = 'http://push.zhanzhang.baidu.com/push.js';
        }
        var s = document.getElementsByTagName("script")[0];
        s.parentNode.insertBefore(bp, s);
    })();
</script>

    
    <script src="/libs/others/clicklove.js" async="async"></script>
    
    
    <script async src="/libs/others/busuanzi.pure.mini.js"></script>
    

    

    
    <script>
        (function (i, s, o, g, r, a, m) {
            i["DaoVoiceObject"] = r;
            i[r] = i[r] || function () {
                (i[r].q = i[r].q || []).push(arguments)
            }, i[r].l = 1 * new Date();
            a = s.createElement(o), m = s.getElementsByTagName(o)[0];
            a.async = 1;
            a.src = g;
            a.charset = "utf-8";
            m.parentNode.insertBefore(a, m)
        })(window, document, "script", ('https:' == document.location.protocol ? 'https:' : 'http:') +
            "//widget.daovoice.io/widget/6984b559.js", "daovoice")
        daovoice('init', {
            app_id: "7b318e23"
        });
        daovoice('update');
    </script>
    

    <!--腾讯兔小巢-->
    
    

    

    

    
    <script src="/libs/instantpage/instantpage.js" type="module"></script>
    

</body>

</html>
